During the day, Aoyama campus is usually crowded with a lot of people.
However, when it gets darker, most of the students go home.
After that, the campus is cleared and almost empty.
It is very relaxing sitting on one of the benches located in the campus because the main street is surrounded by trees and bushes.
Also, it is very dark and calm because sunset is already over then.
Unless you have club activities, there is almost no chance to experience being in the campus at night.
It is fun to chit-chat over a cup of soda under the moonlight.
I recommend you to stay longer one day and enjoy the evening campus.
You should also try ramune soda which you can get one from a vending machine next to the seventh building.
It cost only 70 yen and it tastes very good.